2.8” USB TFT Touch Display Screen for Raspberry Pi

Hi,
I am trying to use this display via ffmpeg as fbdev. But I have got error in the following lines. Could you help me?
I am working on ubuntu 14.04.
"[fbdev @ 0x24b09c0] Framebuffer pixel format not supported.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argumentStream mapping:"
thanks.
I am trying to use this display via ffmpeg as fbdev. But I have got error in the following lines. Could you help me?
I am working on ubuntu 14.04.
"[fbdev @ 0x24b09c0] Framebuffer pixel format not supported.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argumentStream mapping:"
thanks.